Commit 53313b2c authored by Steve Capper's avatar Steve Capper
Browse files

x86: mm: Remove general hugetlb code from x86. 



huge_pte_alloc, huge_pte_offset and follow_huge_p[mu]d have
already been copied over to mm.

This patch removes the x86 copies of these functions and activates
the general ones by enabling:
CONFIG_ARCH_WANT_GENERAL_HUGETLB

Signed-off-by: default avatarSteve Capper <steve.capper@linaro.org>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Acked-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 9e5fc74c

arch/x86/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -210,6 +210,9 @@ config ARCH_SUSPEND_POSSIBLE 
config ARCH_WANT_HUGE_PMD_SHARE

	def_bool y



config ARCH_WANT_GENERAL_HUGETLB

	def_bool y



config ZONE_DMA32

	bool

	default X86_64

arch/x86/mm/hugetlbpage.c

+0 −67
Original line number Diff line number Diff line
@@ -16,49 +16,6 @@ 
#include <asm/tlbflush.h>

#include <asm/pgalloc.h>



pte_t *huge_pte_alloc(struct mm_struct *mm,

			unsigned long addr, unsigned long sz)

{

	pgd_t *pgd;

	pud_t *pud;

	pte_t *pte = NULL;



	pgd = pgd_offset(mm, addr);

	pud = pud_alloc(mm, pgd, addr);

	if (pud) {

		if (sz == PUD_SIZE) {

			pte = (pte_t *)pud;

		} else {

			BUG_ON(sz != PMD_SIZE);

			if (pud_none(*pud))

				pte = huge_pmd_share(mm, addr, pud);

			else

				pte = (pte_t *)pmd_alloc(mm, pud, addr);

		}

	}

	BUG_ON(pte && !pte_none(*pte) && !pte_huge(*pte));



	return pte;

}



pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)

{

	pgd_t *pgd;

	pud_t *pud;

	pmd_t *pmd = NULL;



	pgd = pgd_offset(mm, addr);

	if (pgd_present(*pgd)) {

		pud = pud_offset(pgd, addr);

		if (pud_present(*pud)) {

			if (pud_large(*pud))

				return (pte_t *)pud;

			pmd = pmd_offset(pud, addr);

		}

	}

	return (pte_t *) pmd;

}



#if 0	/* This is just for testing */

struct page *

follow_huge_addr(struct mm_struct *mm, unsigned long address, int write)
@@ -120,30 +77,6 @@ int pud_huge(pud_t pud) 
	return !!(pud_val(pud) & _PAGE_PSE);

}



struct page *

follow_huge_pmd(struct mm_struct *mm, unsigned long address,

		pmd_t *pmd, int write)

{

	struct page *page;



	page = pte_page(*(pte_t *)pmd);

	if (page)

		page += ((address & ~PMD_MASK) >> PAGE_SHIFT);

	return page;

}



struct page *

follow_huge_pud(struct mm_struct *mm, unsigned long address,

		pud_t *pud, int write)

{

	struct page *page;



	page = pte_page(*(pte_t *)pud);

	if (page)

		page += ((address & ~PUD_MASK) >> PAGE_SHIFT);

	return page;

}



#endif



/* x86_64 also uses this file */

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